GWT-Openlayers Offline

[RGeorgy]

I am using GWT Openlayer V1.1 with my project. I have an offline OSM tile server. I tried to run gwt-openlayer offline. Basically the lines

<script src="http://www.openlayers.org/api/OpenLayers.js"></script> <script src="http://www.openstreetmap.org/openlayers/OpenStreetMap.js"></script>
in the main html file crash my system.
I have included service worker, but they do not solve this problem.
I have downloaded the openlayers.js file - and stored it locally - this helped, but other reference files are missing.

Any nice suggestions how to overcome the issue are welcome.